In an informal sense, psychotherapy can be said to have been practiced through the ages, as individuals received psychological counsel and reassurance from others. Purposeful, theoretically-based psychotherapy was probably first developed in the Middle East during the 9th century by the Persian physician and psychological thinker, Rhazes, who was at one time the chief physician of the Baghdadpsychiatric hospital. In the West, however, serious mental disorders were generally treated as demonic or medical conditions requiring punishment and confinement until the advent of moral treatment approaches in the 18th century. This brought about a focus on the possibility of psychosocial intervention - including reasoning, moral encouragement and group activities - to rehabilitate the "insane".

In the 19th century, one could have his or her head examined, literally, using phrenology, the study of the shape of the skull developed by respected anatomist Franz Joseph Gall. Other popular treatments included physiognomy—the study of the shape of the face—and mesmerism, developed by Franz Anton Mesmer—designed to relieve psychological distress by the use of magnets. Spiritualism and Phineas Quimby's "mental healing" technique that was very like modern concept of "positive visualization" were also popular.

While the scientific community eventually came to reject all of these methods, academic psychologists also were not concerned with serious forms of mental illness. That area was already being addressed by the developing fields of psychiatry and neurology within the asylum movement and the use of moral therapy.[1] It wasn't until the end of the 19th century, around the time when Sigmund Freud was first developing his "talking cure" in Vienna, that the first scientifically clinical application of psychology began—at the University of Pennsylvania, to help children with learning disabilities.

Although clinical psychologists originally focused on psychological assessment, the practice of psychotherapy, once the sole domain of psychiatrists, became integrated into the profession after the Second World War. Psychotherapy began with the practice of psychoanalysis, the "talking cure" developed by Sigmund Freud. Soon afterwards, theorists such as Alfred Adler and Carl Jung began to introduce new conceptions about psychological functioning and change. These and many other theorists helped to develop the general orientation now called psychodynamic therapy, which includes the various therapies based on Freud's essential principle of making the unconscious conscious.

During the 1950s, Albert Ellis developed the first form of cognitive behavioral therapy, Rational Emotive Behavior Therapy (REBT) and few years later Aaron T. Beck developed cognitive therapy. Both of these included therapy aimed at changing a person's beliefs, by contrast with the insight-based approach of psychodynamic therapies or the newer relational approach of humanistic therapies. Cognitive and behavioral approaches were combined during the 1970s, resulting in Cognitive behavioral therapy (CBT).[6] Being oriented towards symptom-relief, collaborative empiricism and modifying core beliefs, this approach has gained widespread acceptance as a primary treatment for numerous disorders.

Since the 1970s, other major perspectives have been developed and adopted within the field. Perhaps the two biggest have been Systems Therapy—which focuses on family and group dynamics—and Transpersonal psychology, which focuses on the spiritual facet of human experience. Other important orientations developed in the last three decades include Feminist therapy, Somatic Psychology, Expressive therapy, and applied Positive psychology. Clinical psychology in Japan developed towards a more integrative socially-orientated counseling methodology. Practice in India developed from both traditional metaphysical and ayurvedic systems and Western methodologies.[7]

Since 1993, the American Psychological Association Division 12 Task Force has created and revised a list of empirically supported psychological treatments for specific disorders.[8] In general, cognitive behavioral treatments for psychological disorders have received greater support than other psychotherapeutic approaches. Passionate debate among clinical scientists and practitioners about the superiority of evidence-based practices is ongoing,[9] and some have presented correlational data that indicate that most of the major therapies are about of equal effectiveness and that the therapist, client, and therapeutic alliance account for a larger portion of client improvement from psychotherapy.[10][11] While many Ph.D. training programs in clinical psychology have taken a strong empirical approach to psychotherapy that has led to a greater emphasis on cognitive behavioral interventions, other training programs and psychologists are now adopting an eclectic orientation. This integrative movement attempts to combine the most effective aspects of all the schools of practice.

↑Leichsenring, Falk & Leibing, Eric. (2003). The effectiveness of psychodynamic therapy and cognitive behavior therapy in the treatment of personality disorders: A meta-analysis. The American Journal of Psychiatry, 160(7), 1223-1233.